Duffey was elected as a Democrat to the Seventy-third and Seventy-fourth Congresses and served from March 4, 1933, until his death.
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On April 16, 1971, his sentence was reduced from ten to five years by Judge Warren J. Ferguson and he started serving his sentence.
Upon return, he earned his J.D. from University of Southern California in 1949.
Warren J. Smith (1922–2008), president of the Optical Society of America, 1980